Shovel stoker



G. A. w. REVERMANN.

SHOVEL STOKER.

APPLICATION FILED DEC 20. I921.

W 477'0ENE/5 Patented Dee. l2, 1%22: b

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cesarean ANTON wrtnnrrr nnvnnnraivn, or nrnncnas, NETHERLANDS.

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Application med December 20, 1921. Serial are. scarce,

To all whom itmag concern:

Be it known that l, GUSTAAF ANron /Vir. HELM REVERMANN, a sub ectofothe'Queen of the Netherlands, residing at Utrecht,

Netherlands, have invented certain new and useful Tmprovementsin ShovelStokers, of which the following is a specification. a l i i i. Theapplication of shovel or sprinkling stokers to water tube boilers andfire tube boilers meets the inconvenience that' the height of the spacebelow thetubes is generally not suficie'nt toaccommodate such stokerswhich, as is well known to those skilled in the, art, must be amplydimensioned in order that they may operate in a satisfactory manner. i

It has already beensuggested, in order to obviate this disadvantage, todispense with the fire door ordina ily provided be low the shovel stokerand above the grate to render the fire readilyaccessible, and to let theshovel for throwingthe fuel from a cylindrical dish plate onto the firealso act as a fire door. This suggestion, however, is

not practical in that the shovel cannot com pletely shut off thefurnace. Moreover, the

arrangement of the fuel dish plate substantially at a level with thegrate causes part of the fuel to fall on the dead grate area, whereitcannot beburnt and on which it gradually collects in the form of a heapwhich requires to be periodically removed by hand. p

Now, my present invention has for its object to improve known types ofshovel stokers in such a manner as to render them suitable for ordinarywater tube and fire tube boilers and to avoid the disadvan tagesinherent to such stokers,

With this object in view I the shovel and the ordinary parts associatedtherewith, to wit the shovel shafn'the shovel spring, the spring leverarm and'the spring support, and contingentlv also part of the front wallof the stoker for upward swinging motion, and I mountthe shovel shafteccentrically relative to the pivot of the spring support in such amanner as to cause the tension of the shovel spring to graduallydecrease when the said support is swung. Furthermore, I preferablyprovide the end of the spring Support with a latch held by the shovelspring andndapted to lock the spring support in its operative position.i

adapt the In a stoker' constructed in accordance with my invention theshovel spring has a tendency to hold the hinged portion in its fullyopened position, and also in its inter mediate positions. hinged portionis, swung up the shovel nane spring counteractsthe; gravitation so astopreventsaid portion from freely falling down into its closed positionafter being released;

"The annexed drawing'illustrates ashcvel stoker constructed inaccordance with "my present invention, Figure 1 being'a side elevationalview, and Figure 2a front elevational view,the'cinsher and shovel IIlChanism being omitted. While means for actuating the crusher and shovelform no part of the present lnventionthese means should be. of wellknown form; orsuch as are shown in applicants Patent No. 1362266"granted December 20, 1920 may be used if preferred. I i i 1 is thecasing'into which, fuel is adapted to be fed through a hopper 2 providedin known manner with a crusher/2 After being suitably reduced by saidcrusher, the a fuel falls onto a dished fuel feed plate 8, whencje'it isthrown onthe firebyimpacts imparted thereto by the shovel sin a mannerwell known to those skilled in the art.

The shovel 4 is keyed or in any suitable manner secured. to theshovelshaft 5, to one end of which is keyed or in any suitable manner secureda lever arm 6 engaged by one end. of the usual coiled shovel spring 7for imparting movement to the shovel. The other end of the shovelspringis secured to the latch 13 pivoted to the spring support 8 andadapted to engage. thearm .4, on the casing to lock said support againstmovement.

The portion 9 of the front wall, to which the dished fuelfe'ed plate 3is attached, is mounted to swing on a horizontal shaft 10.

Said portion is provided with a pin 11 proparts associated thereto iscounterbalanced by a counterweight 17. W hen said portion and theadjacent parts are swung up to the dotted line position for inspectionofthe fire they are held in this position by the action of spring 7,and-for this purpose the support 8 1S mounted eccentrically in respectto shaft 5. That is to say shaft 5 is supported in an eccentric borehole of thecylindrical trunnion 16 engaged by an 16 at the end ofsupport8, the diflierent parts being so dimensioned: that when the front wallportion 9 with associate parts is swung up the length of spring 7gradually decreases. In other words the-shaft 5 is pivoted inthecylindrical trunnion l6, and the spring sup- Por Be eu it the id trunio fix to the frame. It will thus benndei'stood that n hen 'the saidportion is swung into its closed. position, the tension oftlie spring isgradually increased'wherehygthegravitation is counteracted. V

"Wvhatlclaimisz 7 s a shovel stoker, a casing having, a

hinged portion a shaft. mounted-in said casing, a shovel "secured tosaid shaft, a lever armalso secured tosaid shaft, a spring having-itsone endgattached tohs aid lever arm, and asupport to which the other endof the spring is attached, said support being connected with-the hingedportion of the casing and mounted for swinging motion. about an axiseccentrically located v with respect to said shaft in suchian anner thatwhen said support 1s swung n an upward d rection the spring tensionisreduced, and vice versa;

*QQIIi shovel StQliEllf, a casing, a shaft mountedhin said casing,ashovel secured to saidi sha ftpalever arrn also secured to said shaft,a spring hav ng 11380118 end attached to i said lever arm, a support towhich the" other end of the spring is 'attzichedQa second horizontalshaft on which portion of the front wall 01'' saidcaslng 1s adaptedtoswing,

and asiiding connection between said front wall portlon and the support,the latter being inounted for swinging inotionahont an axis hingedfront, a spring having one end at tachedto the lever arm and theotherend secured to the support, a cylindrical trunnion,

said. shaft being eccentric-allysupported in said trunnion, said supportmounted for swinging motion about an axis, fiCcfllltllQitlly locatedwith respect to said-shaft in such mannervthat when said supportis swungin an upwarddirection;thefspring tension is reduced and vice versa, v fI 4. In shovel stolier, a casing having a iinged portion, a-shaftnounted in said casing a shovel secured to said shaft, a lever arm alsosecuredto said shaft, a spring hai ing its one end attached tofsaidleverarm,-a

support having a sliding connection with the hinged portion of thecasing, a latch; secured to said support and engagedby the otherend ofthespring, said support being/mounted for swinging notionabou't an axiseccentrically located w th respect to said shaft .in

such a manner that when said support is swung in an upward: directionthe spring tension is reduced, and-vice versa. lntestimony whereot Iafiix my signature.

,GUSTAAF ANTON WILHELM REVERMANN.

